Bobbin for electrical weft detectors



Patented Mar. 5, 1929.

UNITED STATES PATENT OF ICE.

OSCAR V. PAYNE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOXVLES LOOM WORKS, 0F \VORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

BOBBIN FOR ELECTRICAL WEFT DETECTORS.

Application filed December This invention relates to improvements in bobbins more particularly in connection with electrical detectors audit is the general object of the invention to provide a bobbin having a.v portion of the surface thereof formed of a non-corrosive, non-metallic, electric conducting material.

Certain forms of electrical weft detectors have been in use for a number of years but they require a special bobbin having a metallic ferrule which under certain conditions is found to corrode to such an extent as to injure the more delicate yarns. In fact any bobbin which has .a metallic surface in contact with yarn is likely to injure the quality of the latter so that stains or streaks Wiii appear in the finished cloth. This is particularly true in the finer yarns such as nat ural silk and rayon. It is an important object of my present invention to provide a bobbin made of non-metallic material such as commercial bakelite which been impregnated with graphite to such an extent as to render the same a snflicient conductor of electricity to permit its use with an electrical detector.

lVhile a bobbin may be made of material the whole mass of which is impregnated witlrgraphite yet it is suiticicnt for the purposes of a weft detector if that portion of the barrel of a bobbin which normally positioned to contact with the detector treated as previously stated and it'is a more particular object of my invention to provide a. bobbin formed of lHlUBlitt or a similar composition wherein a portion thereof is treated with graphite during the manufacturing processes to render said portion an electrical conductor.

lVith these and other objects in view which will appear as the description proceeds, my invention resides in the combina tion and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings, wherein I have set forth a particular form of bobbin made according to my present invention,

Fig. 1 is a top plan view of a weft detector of the electrical type which cooperates with my improved bobbin,

Figs. 2 and 3 are vertical sections on lines 2-2 and 3-3, respectively, of Fig. 1,

Fig. 4 is an enlarged vertical longitudinal 2a, 1927. Serial No. 243,054.

section on line 44 of Fig. 3 showing the bobbin in cross section. v

It is to be understood that the bobbin set forth herein canrbe used in connection with any electrical detector which depends for its operation upon the uncovering of an electrically conductive surface as the yarn onthe bobbin approaches exhaustion arid in order to illustrate the use of the invention I have shown one form of detector but of course the invention is not limited in its use to this form. The loom framelO has secured thereto a stand 11 provided with an upstanding horn 12 in which vertically reciprocates an actuator lever 13. A controller pin 14 extendsthrough the horn and 15 adapted to lie under the actuator lever at indication of weft exhaustion. Said controller is pivoted to a lever 15 which in turn is pivoted as at 16 to the stand 11, A light tension spring 17 interposed between the lever and a finger 18 rigid with the stand holds the lever against a fixed stop 19 so that the controller is clear of the actuator lover.

The detector comprises a pair of plunger-s 20 each of which slides in and is insulated from a supporting bed 21. Each detector plunger 18 provided with a shoulder 22 against which acts a. compression spring 23. Said springs yield to permit the plunger-s 20 to move forwardly with the bobbin as the lay advances. A battery P has one side "thereof connected by means of wires 24 and to one of the plungers and has the other side thereof connected as by wires 26 and 27 to one side of the magnet M.' The other side of the magnet is connected as by wires 28, 29 and 30 to the other of the plungers 20. It is apparent from Fig. 1 that when plungers2t) are electrically connected current will flow from the battery P over wires 26 and 27 through the magnet M, over wires 28, 29 and 30, through the plungers 20 and return by way of wires 25 and 2 1 to the battery, thus energizing the magnet to move the lever 15 to the right, thus moving the i controller under the actuator lever. The result of this is to interrupt the downward movement of said actuator lever, in the manner set forth in patent to Ryon No. 1,030,748, to which reference may be had for a more detailed explanation of the way in which interruption of the actuator is used to effect a change in the operation of a weft replenishing loom.- 7

My invention relates primarily to the forms of bobbins which electrically connect.

the ,plungers 20. By referring to Fig. l it "will be seen that I have formed abobbin to permit WlIltLlllg of the bobbin the latter is provided with a bore/l2 extending through the barrel 43 on which the yarn is wound. The bobbin is made Jreferabl b 7 cm )lo in n a large number of small pieces of fabric 1nd1- cated at li -r and mixing the same with the bakelite. This composition is well known,

beingused in a: number of different arts and I do notv consider it necessary to enter here upon. a detailed description of the matter or method of ananufacture of bakelite to any other extent than is necessary to describe my invention.

In the formation of the bobbin small particles of textile fabricate and the balrelite compound will be mixed and placed in a mould under considerable pressure and at the same time be subjected to a high tem perature. That portion of the barrel which is to have direct contact with the plungers 20 is impregnated with graphite and during the pressing and heating, operation this graphite becomes carbonized to a sufficient extent to provide the barrel the bobbin with an electrically conductive surface. This surface is'free from the objection present in other forms of conducting materials which have been employed'heretofore in the construction of bobbins, in that it does not corrode yarn.

In the operation of the loom as the yarn becomes depleted the carbonized portion G ofthe ba elite barrel will be uncovered and in time both plungers 20 Wlll contact'with the portion C of the bobbin to connect said plungers electrically. p

From the foregoing it will be seen that I have provided a bobbin for use in elec trical weft detectors wherein that portion of the bobbin which is to cooperate with the detector is impregnated with graphite which has been carbonized by high pressure and temperature to provide the bobbin withran electrically conductive surface. T he whole periphery of portion C of the barrel is thus treated so that the bobbin may be inserted in the shuttle'S in any angular position with assurance that contact will be made between the two plungers 20 when the yarn becomes depleted to a sufficient degree. Hav ng ,thus descrlbed my invention it will be apparent that changes and mod ficatrons may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, b'ut what I claim is: I

l. A bobbin for use with an electrical weft detector for a loom, the bobbin having a barrel a non-metallic portion of which is impregnated with carbonized graphite to provide an electrically conductive surface, said surface being substantially cylindrical.

2. A bobbin for use with an electrical weft detector for a loom, a bobbin having a cylindrical barrel formed of a mixture of -lc e compound and textile material, the barrel being impregnated with carbonired graphite to provide a surface which is electrically conductive. I

3. A bobbin for use with an electrical weft detector for a loom, said bobbin being formed of a mixture of baltelite compound and textile products, and said bobbin being impregnated 'h carbonized graphite to provide an electrically conductive non'metallic surface. V p

A bobbin for a loom having an electrical weft detector provided with two normally insulated bobbin engaging elements to be-connected together electrically to indi ate substantial weft exhaustion, said bobbin including in its structure a balrelite comound, and having that portion the sur- "aceot the bobbin to be engaged by the con tracting elements impregnated with carbonized graphite to render said surface electrically conductive. e r

In testimony whereof I have hereunto affixed my signature. p 7

OSCAR-V. PAYNE. 

